| 21. | Swapping ads was common in the heyday of the Internet bubble.
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| 22. | Swapping spit with the piece of steel seemed the best option.
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| 23. | At dinner our group begins to gel, swapping horse stories.
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| 24. | In the real world organisms have been swapping genes for millennia.
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| 25. | CenterPoint began swapping out Reliant Energy signs and truck logos Tuesday.
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| 26. | The McInnis goal was just the beginning of the goal swapping.
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| 27. | Since hard drives are slower than memory, swapping causes delays.
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| 28. | The teams stayed close, swapping the lead down the stretch.
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| 29. | Instead of swapping music, individual users will share processing power.
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| 30. | Troops are also swapping military items with soldiers from other nations.
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